The placenta ("afterbirth") — is the most important and absolutely unique body that exists only during pregnancy. It connects the two organisms — mother and fetus, providing it with essential nutrients.
Where is and how it looks placenta?
In normal pregnancy, the placenta is located in the body of the uterus on its back (often) or front wall. It is fully formed to
In appearance, the placenta is like a round flat disk. By the time of birth weight of the placenta is
Function of the placenta
gas exchange is carried out across the placenta: oxygen penetrates from maternal blood to the fetus, while carbon dioxide is transported in the reverse direction. First, the fetus through the placenta receives nutrients needed for growth and development. It must be remembered that many substances (alcohol, nicotine, drugs, many drugs, viruses) can easily penetrate through it and can have a damaging effect on the fetus. In addition, it can help get rid of the fruit products of their life. Secondly, placenta provides immunological protection of the fetus, holding cells of the immune system of the mother, who, having got to the fetus and recognizing in it a foreign object could run the reaction of its rejection. At the same time, the placenta passes maternal antibodies that protectfruit from infections. Third, placenta plays the role of the endocrine glands and synthesizes hormones (human chorionic gonadotropin (hCG), placental lactogen, prolactin, etc.) necessary to maintain pregnancy, fetal growth. Fourth,
Normally, the placenta, along with the envelopes (afterbirth) is born through
They want to know about the placenta doctors?
During pregnancy, it is important to identify the signs of impaired function of the placenta — placental insufficiency. To do this during the ultrasound study the structure of the placenta, its location in the uterus, the thickness corresponding to the size of fetal gestational age. In addition, blood flow is studied in placental vessels.
The degree of maturity
This option, as the doctors say, "ultrasound", that is, it depends on the density determined by ultrasound structures placenta.
There are four degrees of maturity placenta:
- Normally, up to 30 weeks of pregnancy should be determined by the zero degree of maturity of the placenta.
- The first degree is considered to be acceptable from 27 to 34 a week.
- The second — from 34 to 39.
- Since 37 weeks may be determined by the degree of maturity of the third placenta.
In late pregnancy, there comes the so-called physiological aging of the placenta, with a reduction of the area of its exchange surface, the appearance of areas of salt deposits.
Determined by ultrasound. As mentioned above, in normal pregnancy, the placenta is located in the body of the uterus. Sometimes an ultrasound examination in the first half of pregnancy is detected that the placenta is located in the lower parts of the uterus, short or even overlapping region of the internal cervical os. In the future, with the progression of pregnancy, the placenta is often displaced from the top of the lower parts of the uterus. However, if the period of 32 weeks placenta
Placenta previa can lead to bleeding, which can occur during
Is also determined by ultrasound — placentometry: after establishing the attachment of the placenta sought a site where it has the largest size that is determined. Thickness placenta, as mentioned, increases continuously to
The deviation from the norm of at least one of these parameters may indicate trouble in the course of pregnancy.